Mixing-machine



T. I. STURTEVANT.

IIIIIIIIIII IIIIIIIII MIXING MACHINE.

AFPLlcATloN r|LED1uN1o,I92|.

Patented 001;. 11, 1921.

5 SHEETS-SHEET I.

` T. J. STURTEVANT.

MIXING MACHINE.

APPLICATION FILED JUNE 10| 192|. Y 1 1,393,181. Patented ont. 11,1921.

5 SHEETS-SHEET 2.

T. J. STURTEVANT.

MIXING MACHINE. APPLICATION FILED JUNE I0, 1921.

Patented Oct. 11, 1921.`

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5 SHEETS-SHEET 3.

T. I. STURTEVANT.

MIXING MACHINE.

- APPLICATION FILED .IUNE I0, 192k 1,393,181. Patented Oct. 11, 1921.

5 SHEETS-SHEET 4.

In Ver: Hoz".

T. I. STURTEVANT. MIXING MACHINE. APPLICATION man 1 uNExo. 192|.`

1,393,181. Patented oct. 11, .1921.

5 SHEETS-SHEET 5.

In Vezzlor ing mechanism of any suitable construction, and in thepresent instance, in the form of a base comprising longitudinal channels1 connected by transverse channels 3.

The rotary casing 5, in the present Vinstance of the invention, is'split longitudi-V tially the length of the casing. The ends of curedthereto by bolts 34h.

the casing may be strengthened by outstanding` ribs 19, Y

rejecting outward from the ends of the rotary casing are two-p'artrhubs21 and 23 having bosses25 receiving through bolts 27 for detachablysecuring the hubv parts to-` gether. Y

To insure registry of the upper and lo-wer parts of the rotary casingwhen assembled, the hubs may have outstanding flanges 29 and 30. Theflange 29 fits'in a flanged collar 31. detachably secured to the flange29 by bolts 33. A gear 34 has a flanged web 34a fitting the hub flange30 and detachably se- This flanged web, therefore, and the flangedcollar 31, de-

sirably serve to insure proper registry of the 4upper and lower parts ofthe rotary casing.

Y When theA mixer is employed to mix` ground phosphate rock and acid,the mixture will have a semi-liquid character, and therefore, it isdesirable to prevent so far as possible, escape of liquidrfrom thecasing.

. Some'liquid,`however, may escape into the hubs. Therefore, the lattermay be formed to present conical recesses 85 communicating `with outletports 37 through which the liquid grooves 43m the hubs. Oil cups 45supplyV The bearings lubricant for the bearings. may have caps 47 whichmay be detached when'it is desired to separate the parts of the casing.l Y

The means for mixing the materials in the casing, in the presentinstanceof the invention, comprises a shaft 49 journaled in bear'- ings51 on standards 53 rising from the base, said bearings being providedwith bushings 55 and oil cups 57.

The shaft 49 may have a portion 59 (Figs. 3 and 5) slabbed off so thatthis shaft porf tion,in the present instance, is of hexagonal form.

l Projecting through elongated transverse holes 61 in this shaftportion, are mixing elements, in the present instance, in the form ofpaddles 63 having straight shanks and upon, the paddle may be shiftedlaterally,

and the gib 69 may be driven in the hole and secure the paddle to theshaft. When it is desired to remove the paddle from the shaft,

the gib is knocked out, and the paddle is shifted laterally andwithdrawn from the hole. Thus, the paddles may be Vquickly and easilyassembled with the shaft, and removed therefrom as desired. l v Y Theshaft may have flanges 71 (Fig. 5) thereon adapted to seat in'recesses72 in the ends of the casing, and the shaft may have flanges 73occupying the conical recesses35 in the hubs, and adapted to deflect anyliquid escaping past the flanges 71 toward the ports 37 referred to. Toprevent escape of liquid outward toward the ends of the hubs, sleeves 75may be seated in recesses in the hubs, and have inturned flanges 71 forengagement with portions of the shaft 49.A

It will be noted that the casing hubs rotate in bearings which supportthe heavy casing independently of the shaft, and as a consequence, theshaft is relieved of the weight of the casing.

A suitable housing may be provided for the rotary casing. In thepresentinstance, a housing 79 (Figs. 1, 2, 8 and 5) is provided split topresent a lower portion 81 mounted on and secured to the base, and anupper portion 83 resting on'the lower portion. These portions haveoutstanding flanges 85 detachably secured together by bolts 87 .Y l

In the top of the upper housing portion 83 is a neck 89 adapted todeliver materia-ls from a hopper 91 (Fig. 5) to the mouth 17 of therotary casing when the mouth is in registry with said neck. Acid orother liquid may be delivered to the mouth of the mixer through a'pipe93 which may have an end entered either in a hole 95 or a hole 97 in the top of the upper portion -of the housing. If

one of these holes is not used, it may be the paddle shaft 49. Thismea-ns, in the present instance, comprises a Y shaft 109 (Figs. 1,2 and5) journaled in bearings 111 on standards 113 rising from the base. Thisshaft is provided with a tight pulley 115 and a loose pulley 117 adaptedto receive va belt which may be driven from any suitable source ofpower.

Fast on the shaft109 is a pinion 119 meshing with a large gear 121 faston the paddle shaft 49. y

v Suitable means may be provided for slowly rotating the mixer casing 5.In the present instance, this is accomplished by a transmission drivenfrom the paddle shaft 49. This transmission may comprise a stub shaft123 (Figs. 1, 5, 9 and 10) having a disk plate 125 projecting from oneend thereof secured by bolts 127 to a flange 129 on one end of thepaddle shaft 49.

A pinion 131 is mounted loose on the stub shaft 123, and meshes With alarge gear 133 on a back shaft 135 journaled in bearings 137 onstandards 139 rising from the base. Fast on the back shaft is a pinion141 meshing with the gear 34 referred to, which is secured to one of thehubs of the rotary casing.

The pinion 131 has clutch teeth 143 pro-l jecting laterally from one endthereof for coperation with clutch teeth 145 projecting from a frictiondisk 147 loose on the stub shaft 123. This friction disk has a series ofholes 149 adjacent the periphery thereof adapted to receive inserts 151of Wood orv The construction is such that the inserts 151 will be`vpressed by the coil springs into frictional engagement with the ringV153, and the disk plate 125, and when the pinion 131 is slid on the stubshaft 123 to bring its teeth 143 into clutching engagement Withvthefriction plate teeth 145. the drive will be frictionally transmittedfrom the paddle sha-ft 49 to the pinion 131 The drive will betransmitted from the latter through the gear 133, pinion 141and gear 34to the rotary casing 5. The frictional connectionV between the paddleshaft 49 and stub shaft 123 will enable the ring 153 and disk plate 155to slip relatively to the inserts of the friction plate, so as graduallyto overcome the inertia of: the massive casing and start the rotationthereof Without liability of shearing gear teeth of the transmission, orother injury thereto.

Suitable means may be provided for slid- 'ing the pinion 1.31 along thestub shaft to connect the clutch, and suitable means may be providedautomatically to disconnect the clutch to arrest rotation of the mixercasing when the mouth of the latter comes into registration with thehopper neck 89.

To vaccomplish this, in the present instance, a pair of arms 163 (Figs.1, 5 and 9) may be mounted fast on a rock shaft 165 carried by brackets167 projecting laterally from the base, and the upper ends of said armsmay have pins 169 entered into a c1rcumferential groove 171 in the hubof the pinion 131.

Fast on the rock shaft 165 is an arm 173. Pivota'lly connected to thefree end of the arm 173 is a stop arm 175 having a nose 177 adapted forengagement with a stop lug 179 projecting from the face of the gear 34referred to.

To move the stop arm 175 into and out of position for engagement withthe stop lug 179, and to hold the stop arm in position for engagementwith the stop lug, a toggle device 181 may be provided comprising links183 and 185 connected hy a pin 187. The link 183 is pivotally connectedby a pin 189 with the stop arm, and the link 185 is mounted fast on arock shaft 191 mounted in brackets 193 on one of the paddle shaftbearings 51. The toggle link 183 has an eX- tension 195 projecting overthe link 185, and said extension is provided with a stop screw 197. Ahandle 199 fast on the rock shaft 191,.enables manual operation of thetoggle, and this handle may be provided With suitable connectionsenabling distant control of the toggle if desired.

Pivotally connected to and depending from the arm 173 referred to, is alrod 201 projecting through a plate 203 on the base.

A coil spring 205 encircles the rod. and isconiined between the plate203 and a cup 207 seated on a head 209 on the rod and limited bya nut211. A larger and heavier coil spring'213 encircles thecoil spring 205and rests on the head 209,` said spring 213 being shorter than thespring 205.

`When it is desired to close the clutch to initiate rotation of thecasing, `the handle 199 is rocked in a contraclockwise direction,thereby buckling the toggle and Withdrawing the stop. arm 175 out fromengagement with the stop lug 179 on the gear 34. Thereupon, the coilspring` 205 operates through the rod 201 to pull the arm 173 downward,which rocks the arms` 163 toward the right, thereby sliding the pinion131 along the stub shaft 123, and causing the pinion clutch teeth 1.43to engage the friction plate clutch teeth 145.

Then the drive will be transmitted from the shaft 49 through thefrictional device, and the clutch teeth to the pinion 131. which Willrotate the gear 133, pinion 141, and gear 34, and cause the casing torotate.

The casinghaving received a batch of materials to be mixed, will slowlyrotate to carry its mouth117 through a complete rotation. As the mouthapproaches its lowest position, it discharges the mixed materials fromthe casing, and the motion of the lat` ter is sufficiently slow toreadily permit this discharge. f

vrlhe stop lug 179 is so positioned on the gear 34, that when said stoplug has been rotated around into contact with the stop arm nose 177, themouth of the casing will be in registry with the hopper neck 89.

When the stop lug 179 engages the stop arm nose 177, the gear 34 pullsthe stop arm 175 upward, thereby rocking the armr173 upward, whichthrows the arms 163 to the left, thereby opening the clutch. As the arm173 rocks upward, the coil spring 213 is brought into engagement withthe plate 203, and said spring serves yieldingly lto arrest the rotationof the casing. Thus7 the momentum of the massive casing is gradu-V allyovercome, and the casing is brought toV rest without injury to themechanism.

l/Vhen the toggle is straightened, .it securely holds the stop arm inposition to be engaged by the stop lug 179. Since the nose of the stoparm is offset to the right from the axis of the pin connecting the stoparm with the arm 173, on engagement of the lug with the nose, there is acomponent of force tending to rockthe stop arm in a contraclockwisedirection., To prevent liability of buckling of the toggle from thisforce, the stop screw 197 may be adjusted so thatrwh'en the toggle isAin locking position, the axis of' the pin 197 connecting the togglelinks will be somewhat beneath a straight line passing through the axesof the pins 189'and 191. The consequenceV is, that the component offorce referred to, will tend to buckle the links downward, but this willbe resisted by the engagement of the stop screw 197 with the upper`edgeof the toggle' link 185.

By the mixing machine described, batches of materials tobe mixed may beintroduced intov the rotary casing, and they will be thoroughlymixed bythe paddles therein which may be continuously rotated. The character ofthe transmission from the paddle shaft to the rotary casing may be suchthat a proper speed reduction is obtained, so that by the time therotary ycasingis turned through an arc of substantially 180, or one-halfrotation, sufficient time` will have elapsed to enablel the batch in thecasing toV be mixed properly. Thus, the transmission in a sense is atiming mechanism which will automatically determine the minimum mixingperiod, and this construction insures that successive batches will bemixed at least the minimum length of time.

When themixer casing has been rotated to.

move its mouth past discharge position, the

materials will be automatically discharged, and when said mouth has beenbrought back to receiving position, the rotary casing will beautomatically arrested without attention on the part of the operator.vAfter the next batch has been delivered into the rotary casing, theoperator shifts the handle 199 to close the clutch and initiate rotationof the casing, and the operations are repeated as described in respectto the -previous batch. The stopping mechanism described servesautomatically to bring the rotary casing to rest with the mouth of thecasing in position to receive materials from the delivery opening 89 ofthe housing, but since the casing 9 rotates at a relatively slow speed,it may be desirable, in some cases to introduce the batchy of materialsinto the casing without stopping the casing. Y To this end, the mouth 17of the casing is made considerably wider than the deliveryV opening orneck 89 as will be apparent from Fig. 3, so that the mouth, althoughmoving, will remain opposite the delivery opening 89 long enough vtoreceive the charge of materials. Y

, To operate the mixing machine with the casing 9 rotating continuously,it is simply necessary to retain the stop arm 175 out of its operativeposition, and this may be done by holding or securing the handle 199 inits trip position. charging the casing 9 during the rotation thereof,the length of 'time each batchofl upperhousing portion is lifted fromthey lower housing portion. When the flanged collar 31 and gear 311 aredetached Vfrom thev hubs 21 and 23, the bolts connecting the `upper partof the rotary casing. with the lower part are removed, the caps of thebear# ings for the hubs of the rotary casing are lifted, and then theupper part of the rotary casing may be removed, thereby exposing thepaddles and their supporting shaft. lf it is desired to substitute a newpaddle for an old one, this may be readily accomplished by knocking outthe lock gib therefor, and the old paddle may be removed from the shaftand anew onejsubstit'uted therefor as described. 1

The mixer described is strongand simple in construction, reliable inoperation, and not likely to get out of order.

It will be understood that the invention is not limited'to the specificembodiment shown, and that various deviations may be made therefromwithout departing from the spirit and scope of the appended claims.

lV hat kis `claimed is 1. A machine for mixing materials, comprising, incombination, a rotary casing having a mouth disposed between the ends ofthe casing for receiving and discharging materials, hubs projecting fromopposed ends of said casing, bearings supporting said hubs, a shaftprojecting through said rotary casing and hubs, bearings for said shaft,mixing elements carried by said shaft, means to rotate said shaft, and aspeed reduction transmission for rotating said casing from said shaft.

2. A machine for mixing materials, comprising, in combination, a rotarycasing having a mouth formed in a wall of the casing for both receivingand discharging materials, bearings supporting said casing, a shaftprojecting through said casing having mixing elements thereon, bearingsfor said shaft to support the same independently of said casing, anddriving means for said casing and shaft having provision for rotatingthe former at a slower speed than the latter.

3. A machine for mixing materials, comprising, in combination, a rotarycasing, hubs projecting from opposed ends of the casing, bearingssupporting'the hubs, a shaft extending through the hubs and casing andhaving elements thereon for mixing materials within the casing, meansindependent of the casing for supporting the shaft, means acting throughone of said hubs to rotate the casing, and means for rotating the shaftat a speed different from the speed of the drum.

4L. A machine for mixing materials, comprising, in combination, a rotarycasing, a shaft projecting through said casing having mixing elementsthereon, means to drive said shaft, a back shaft, gears for rotating theback shaft from the mixer shaft, and gears, one of which operatesthrough an end of the casing to rotate the casing from the back shaft.

5. A machine for mixing materials, comprising, in combination, a rotarycasing having a mouth disposed between the ends of the casing forreceiving and discharging materials, a shaft projecting through saidcasing having mixing elements thereon, bearings for said casing,bearings for said shaft, a back shaft, a gear on said casing, a pinionon the back shaft meshing with said gear, a gear on the back shaft, anda pinion driven by the mixer shafty and rotating the backv shaft gear.

6. A machine for mixing materials, comprising, in combination, a rotarycasing, a shaft projecting therethrough having mixing elements thereon,bearings for said casing, bearings for said shaft, speed reduction gearsat one end of the shaft for driving said shaft, and speed reductiongears driven from the opposite end of said shaft for ro- 'rating saidcasing.

Y. A machine for mixing materials, commouth is in the upper position,and for discharging materials when the mouth is in the 4lower position,a shaft projecting through the casing and having mixing elements thereonfor mixing materials introiduced into said casing, mea-ns to rotate saidshaft, and speed reduction means to impart rotation from said shaft tosaid casing at a speed sufficiently slower than the shaft to effectmixing of the materials while the casing mouth is moved from the upperto the lower position.

8. A machine for mixing materials, comprising, in combination, a base,two sets of bearings mounted thereon, a rotary casing having oppositelyprojecting hubs journaled in one of said sets of bearings, a shaftjournal-ed in the other set of bearingsV and having mixing elementsthereon, and means to transmit rotation from said shaft to said casing.

9. A machine for mixing materials, comprising, in combination, a rotarycasing, a shaft having mixing elements thereon within the casing, meansto rotate said shaft, a transmission for imparting rotation from saidshaft 'to said "casing including frictional means gradually to initiaterotation of said casing, and clutch means controlling the drivingconnection betweeny said shaft and casing. l j

10. A machinefor mixing materials, comprising, in combination, a rotaryoasinghaving a mouth for receiving and dischargng materials, meanswithin the casing for mixing the materials therein, means slowly torotate said casing, and means automatically to arrest rotation of saidcasing when said mouth is in position to receive materials.

11. A machine for mixing materials, comprising, in combination, a rotarycasing h aving a mouth for receiving and discharging materials, meanswithin the casing for mixing the materials thereinmeans slowly to rotatesaid casing to move its mouth from receiving to discharging position,and means .automatically to arrest rotation of said cas- `for receivingand discharging materials,`

speed reduction means for rotating the casing from said shaft at aslower speed than the. latter to move lthe casing mouth from receivingtodischarging position, and means automatically to arrest rotation of thecasing after said mouth has been moved to dis- `I naterials, a. shafthaving mixing elements thereon, a gear for rotating said'casing, andmeans operated by said gear for automa-tically arresting rotation ofsaid casing each time it makes: a. co-mplete rotation.

15. A machine for mixing materials, comprising, in combination, acasing, means for mixing materials introduced into said easing, a shaftfor said mixing means, and a transmission between said shaft and casingincluding a clutch and frictional driving means.

16. A machine for mixing materials, comprising, in combination, acasing, a shaft having mixing elements thereon for mixing materialsintroduced into said easing, and a transmission between said shaft meansfor rotating said shaft casing for rotating the latter from the formerand'includinga clutch, and means automatically to open saidclutch Vtoarrest rotation of said casing.

` 17. A machine for mixing materials, comprising, in combination, arotary casing, a shaft having mixing elements thereon for mixingmaterials introduced into said casing, a transmission between said shaftand ,casing including a clutch, and means controlled by saidtransmission automatically to open said clutch to arrest rotation ofsaid casing,

18. A machine for mixing materials, comprising, in combination, a rotarycasing, a `Shaft having elements thereon for mixing materials, atransmission between said shaft and casing for rotating the latter fromthe former. said transmission having a clutch, manually operable meansto close said clutch to initiate rotation of said casing, and meansautomatically to arrest'the rotation of said casing after it has turneda predetermined extent.

19. A machine for mixing materials, comprising, in combination, a rotarycasing', a shaft havingelements thereon for mixing materials introducedinto said casing, transmission gears between said shaft .and casing, aclutchicoperating.with said transmission gears, a lug on one of saidgears, a stop arm, means to move said stop arm into andout 0j the pathof said lug, and means connecting ,said stop arm with said clutch, thatthe lug on the gear on engagement with said stop arm, may open saidclutch and arrest rotation of said casing.

20. Amachiiie for mixing materials, comprising, in combination, a rotarycasing, a shaft having elements thereon for mixing `materials introducedinto said casing, a gear transmission between said shaft and casingincluding a clutch, and means operated by one of the gears of saidtransmission for automatically opening said clutch to arrest rot-ationof said casing.

21. A machine for mixing materials, comprising, in combination, a rotarycasing, a

ing a mouth for receiving and discharging t having elements thereon for-mixing materials introduced through materials, a shaf said mouth intosaid casing, a transmission between said shaft and casing, and meansautomatically to interrupt s aid transmission toi arrest rotation ofsaid casing when said mouth is brought to receiving position. l 23. Amachine for mixing materials, comprising, in combination, a rotarycasing having a mouth for receiving and discharging materials, a shafthaving elements thereon for mixing materials introduced through saidmouth into said casing, Ya transmission between said shaftjand casing,and means automatically to interrupt said transmission to yarrestrotation of'said casing when Vsaid mouth is brought to Vreceivingposition, said arresting means including yieldable means to check themomentum of the casing and bring it to rest. y 2st. A machine for mixingmateria-ls, comprising, in combination, a rotary casing, a shaft havingelements thereon for mixing materials introduced into said casing, agear transmission between said shaft and casing including a clutch, astop element on one of the gears of said transmission, a stop mem,- bermovable into and out of the path of said stop element, and meansoperated by said member to open said clutchV when said stop element isrotated into engagement with said stop member.

25. A machine for mixing materials, coniprising, in combination, arotary casing, a shaft having elements thereon for mixing materialsintroduced into said casing, a gear transmission between said shaft andcasing including aclutch, a stop elementY on one of the gears of saidtransmission, a stop meniber movable. into and out of the path of saidstop'element, means operated by said member to open the clutchautomatically on movement- Of Said ,member by engagement of said elementtherewith, and toggle means for holding said member in the path of saidelement.

26. A machine for mixing materials, comprising, Lin combination, arotary casing a shaft having elements thereon formixiug materialsintroduced into said casing, a gear transmission Vbetween said shaft andcasing including a clutch, a stop element on one ot the gears of saidtransmission, a stop member movable into and out of the path of saidstop element, means operated by said mem ber to open the clutchautomatically on movement of said member by engagement or said elementtherewith, and toggle means for holding said member in the pathy of saidelement.

27. A machine for mixing materials, comprising, in combination, a rotarycasing, a shaft having elements thereon for mixing materials introducedinto said casing, a gear transmission between said shaft and casingincluding a clutch, a stop element on one of the `fears of saidtransmission, a stop membel` movable into and out of the path of saidstop element, means operated by said member to open the clutchautomatically on movement of said member by engagement of said elementtherewith, toggle means 'for holding said member in the path of saidelement` means to buckle said toggle to move said member out of the pathof said element, and means released thereby automatically operating toclose said clutch.

28. A machine for mixing-materi als. comprising, in combination, arotary casing, a shaft having elements thereon for mixing materialsintroduced into said casing` a gear transmission between said shaft andcasing including a clutch` a rock arm for shifting said clutch, a memberfor rocking said arm, a spring cooperating with said member to close theclutch` a stop arm connected to said member, and a stop element on oneoit the gears of said transmission for engagement wth said stop arm torock said member against the resistance ot said spring to open saidclutch and arrest lrotation of said casing.

29. A machine tor mixing materials, comprising, in combination, a rotarycasing for receiving and discharging materials, means for mixing thematerials in said casing, means frictionally to initiate rotation ofsaid casing, and means to arrest rotation ot said casing includingmeansl yieldingly to check the momentum ot said casing inbringing it torest.

30. A machine for mixing materials, comprising, in combination, a rotarycasing for receiving and dischargingmaterials, means to mix materials insaid casing, means for rotating said casing including a lrictionalclutch Jfor gradually initiating rotation of said casing, and means toarrest rotation ot said casing including a spring for graduallyabsorbing the momentum of said casing .in bringing the same to rest.

3l. A machine for mixing materials, comprising, in combination, a rotarycasing for receiving and discharging materials, means for mixingmaterials introduced into said casing, means tor rotating said casingincluding means frictionally to initiate its rotation, meansautomatically` to arrest rotation of said casing', and means yieldinglyto check momentum of the casing as it comes torest.

32, A machine for mixing materials, comprising, in combination, a rotarycasing having a mouth for receiving and discharging materials, means formixing materials introduced into said casing, driving means to rotatesaid casing including means gradually to overcome the inertia of thecasing and initiate its rotation, means controlled by the rotation ofsaid casing automatically to arrest its rotation, and means to absorbthe momentum of said casing in coming to rest.

33. A machine for mixing materials, comprising, in combination, a casingfor receiving and discharging materials. means for mixing materialsintroduced into said casing, driving means for rotating said casingincludingV a positive clutch anda frictional device, and meansautomatically to open the clutch to interrupt Vthe drive for said casingand stop the casing in a predetermined position. A

34. A machine for mixing materials, comprising. in combination, a casingfor receiving and discharging materials, means for mixingmaterialsintroduced into said casing, driving means for rotating said casingincluding a positive clutch and a frictional device, means automaticallyto open the clutch to interrupt the drive for said casing, and means toarrest the casing after opening of said clutch.

35. A machinefor mixing materials, comprising, in combination, a rotarycasing constructed of longitudinally separable sections removablysecured together and having a mouth disposed between the ends of thecasing for receiving and discharging materials, a shaft projectingthrough said casing having mixing elements thereon, and means detachably to secure said elements to said shaft, said means beingaccessible on separation of said sections.

36. vA machine for mixing materials, com prising, in combination, arotary casing constructed of longitudinally separable sections andhaving a mouth disposed between the ends of the casing for receivinganddischarging materials, means detachably to connect said sections, ashaft having holes therein, paddles projecting through said hol-es, andgibs detachably to secure said paddles in said holes.

37, A machine `tor mixing materials, comprising, in combination, arotary casing, a shaft having holes therein, paddles having shanksinsertible in said holes, each shank having a notch arranged to engagethe shaft and determine the adjustment of the shank within a hole ofthe'shaft, and gibs adapted to wedge between said shanks and walls ofsaid holes to secure the paddles to the shaft.

38. A machine for mixing materials, comprising, in combination, a rotarycasing, a shaft having holes therein, paddles having Shanks insertiblethrough said holes, each shank having a shoulder adapted toengage theshaft and determine the adjustment of the shank through a hole of theshaft, and gibs insertible in said holes between said shanks and wallsof the holes to secure the paddles to the shaft.

39. A machine for mixing materials, com prising, in combination, arotary casing formed of separable, substantially semicylindricalsections, means to insure registry of said sections, `means detachablyto connect said sections, means for mixing materials introduced intosaid casing, and means4 for rotating said casing and mixing means.

40. A machine for mixing materials, comprising, in combination, a rotarycasing having hubs projecting from opposite ends thereof, bearings forsaid. hubs, said casing and hubs being split longitudinally to form twoparts, means detachably to .secure said parts together, and means formixing mate-- rials introducedV into said casing.

41. A machine for mixing materials, comprising, in combination, a rotarycasing formed of parts detachably secured-together and having an openingadapted to both receive `and discharge materials, means for mixingmaterials introduced into said casing, means for slowly rotating saidcasing from receiving to discharging position, and a housing inclosingsaid rotary casing having separable parts to allow access to saidcasing. v

42. A machine for mixing materials, comprising, in combination, a rotarycasing having vparts separable sections detachably connected, a 'shaftprojecting through said rotary casing havingmixing elements thereon,means detachably to connect the mixing ele- Y ments with said shaft,means for rotating v said shaft and casing at different speeds, and

a housing having parts separable to permit separation of the rotarycasing sections ,and allow access to the meansfor detachably connectingthe mixing elements with said. shaft.

' 43. A machine for mixing materials, comprising, in combination, arotary casing for receiving and discharging materials, means for mixingthe materials in said casing, a sectional housing for said rotary casingspaced therefrom and having an opening in one of the sections and acover for said opening adapted to be removed to allow access to thespace between said casing and housing.

44. A machine for mixing materials, Vcomprising, in combination, arotary mixing casing having axially separable sections removably securedtogether, a shaft extending axially through said casing and havingmixing elements thereon for mixing materials introduced into the casing,means to rotate the casing and shaft, and means including cooperatingannular flanges on the shaft and wall of the casing to resist escape ofmaterials from said casing along the shaft, the shaft with the flangethereon being movable to and from operable position upon separation ofsaid sections.

45. A machine for mixing materials, comprising, in combination, a rotarymixing casing having axially separable sections removably securedtogether, a shaft extending axially through said casing and havingmixing elements thereon for mixing materials introduced into the casing,means to rotate the casing and shaft, and means upon the shaft and endvwalls of the casing to resist escape ofl materials from the casingalong the shaft, including flanges projecting into coperatin recesses,the coperating'flanges and recesses being separable upon separation ofsaid sections and removal of the shaft.

46; A machine for mixing materials, comprising, in combination, a rotarymixing casing formed of longitudinally separable sections, a shaftwithin said casing having elements for mixing materials therein, meansfor securing said sections in registry including annular flanges on thesections and collars tightly embracing the flanges, and means forrotating the mixing casing.

47. A machine for mixing materials, coinv prising, in combination, arotary mixing casing formed of longitudinally separable sections havinghubs vat the opposite ends of the casing, bearings supporting said hubs,means for rotating the casing, means for mixing the materials within thecasing, and means for securing said sections in registry includingannular surfaces on said hubs and collars tightly embracing saidsurfaces.

48. A machine for mixing materials, comprising, in combination, a rotarymixing casing having hubs at the ends thereof, a mixing shaft extendingthrough the casing and hubs and having elements thereon for mixingmaterials introduced into said casing, means to rotate said casing, andmeans for preventing materials from working along said shaft, includinga pocket formed within each hub to surround said shaft and having drainconduits radiating from the pocket voutwardly through the walls of thehub, and flanges upon the shaft within said pockets to cause thematerials working along the shaft to drop into the pockets. Y

19, A machine for mixing batches of materials, comprising, incombination, a rotary casing having a mouth disposed vbetween the endsof the casing for receiving materials When the mouth is in the upperposition and for discharging materials When the mouth is in the lowerposition, means for rotating the casing continuously, means forintroducing a batch of materials through the mouth of the casing duringthe rotation thereof, and means for mixing the batch of materials Whilethe casing rotates from the receiving to the discharge position.

50. A machine for mixing batches of ma- 15 terials, comprising, incombination, a rotary casing having a mouth through which the batch ofmaterials enters and leaves the casing, means for rotating the casingcontinuously, means for introducing a batch of materials into the casingduring the rotation thereof, a mixing shaft extending through saidcasing and provided with mixing elements, and means for operating saidshaft to complete the mixing operation While the casing rotates from thereceivingl to the discharge position.

In testimony whereof, I have signed my name to this specification.

THOMAS J. STURTEVANT.

